How to tell if HPFP is leaking - Pontiac Solstice Forum
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post #1 of 24 (permalink) Old 04-15-2017, 10:15 AM Thread Starter
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How to tell if HPFP is leaking

I have a question for everyone that's familiar with the topic. I've had the p2188 code now for most of last year. I cleaned the connectors and changed the oil yesterday. For the road test I did yesterday after, it seems to have finally fixed the issue. I have been in contact with a member here and he told me to completely clean the contacts, change the oil and hopefully that would fix my p2188 code. While there was a raw gas smell coming from the oil, there was no "rainbowing" of the oil after it sat for about 2 hours, something I would have thought would have happened if the fuel in my oil was bad enough. I ran the car after changing the oil for about 20 minutes, came home and my HPFP tick was finally steady. However, when I went to smell my new oil, an odor of raw fuel was evident yet. Other then smelling my oil, is there any other way to check for fuel in my oil? After I've dealt with the weird HPFP tick for almost a year, is it possible that my HPFP seals are shot? Any thoughts or help on how to check for gas in my oil would be appreciated. Could it be a leaky injector and not the HPFP leaking? Would that cause a fuel smell in oil? Is this something the dealer will have to diagnose? I hate to throw a $350 HPFP on it and cross my fingers!!!

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post #2 of 24 (permalink) Old 04-15-2017, 11:17 AM
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Short of having the oil tested I'm not sure. Sorry

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post #3 of 24 (permalink) Old 04-15-2017, 07:56 PM
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Exactly that ^^^ take an oil sample and have it analyzed. An oil analysis can inform you of many items. Use a reputable lab as their expertise and experience is worth it.
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post #4 of 24 (permalink) Old 04-15-2017, 08:41 PM
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post #5 of 24 (permalink) Old 04-16-2017, 05:42 AM
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Hard to think that gas could be interning the oil from the HPFP. A easy test is to remove the pump and them reconnect the lines and turn on the key. Let it set for a while and see if you see or smell gas. If it was leaking in from the injectors it would certainly misfire on startup with any amount of raw gas in the cylinders. An oil analyst would be a good place to start.

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post #6 of 24 (permalink) Old 04-16-2017, 06:56 AM
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I'll add my agreement. This is the lab I use: Blackstone Labs

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post #7 of 24 (permalink) Old 04-17-2017, 05:01 AM Thread Starter
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Quote:
Originally Posted by Hoosier GXP View Post
Hard to think that gas could be interning the oil from the HPFP. A easy test is to remove the pump and them reconnect the lines and turn on the key. Let it set for a while and see if you see or smell gas. If it was leaking in from the injectors it would certainly misfire on startup with any amount of raw gas in the cylinders. An oil analyst would be a good place to start.
My understanding was that when the HPFP goes 'bad', that 1 of 2 things can happen. It either doesn't push enough fuel through (which isn't happening cause I see almost 1800psi at WOT), or it leaks fuel into the motor....am I wrong? I know that I've had the erratic HPFP tick. It's been very inconsistent. My car never misses or chugs on startup....as a matter of fact, it's the quickest starting car I've ever owned. But I changed the oil last week, drove it for 30 minutes, parked it and then smelled the oil. I could smell the raw gas in the oil. Maybe my engine is tired and needs a rebuild. Maybe the 24psi of boost is pushing the raw fuel past the rings? Anywho, I've been in touch with a member here in offline emails and he has given me all sorts of pointers for my p2188 code. One is that the code comes on because the oil gets fuel soaked and causes a rich condition. I know that after DFCO happens, my STFT drop to -70 and sit there till I blip the throttle.

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ZZPerformance dyno tuned - 286HP, 317ft/lbs of torque at 23psi of boost.
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post #8 of 24 (permalink) Old 04-17-2017, 06:00 AM
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There have been reports of the HPFP leaking though he bottom seal into the oil. This is one, I have seen others.

Yikes! Dead HPFP

Removing the pump was pretty easy, but after doing so I observed raw gas and oil mix running out of the hole where the pump plunger goes into the head. It looks like whatever seals the gas in the pump from the mechanical plunger area failed, causing raw gas to spray into the cam area. Oh crap! (Censored because I actually said something else)

I pulled the dipstick to see if I smelled gas in the oil pan oil, or whether the oil level was higher than the full mark. Fortunately it looks like not too much gas ended up in the pan. Next I checked the pump roller plunger that rides on the cam pump lobe to see if there was damage or scoring. Other than being wet with a gas oil mix, it looked okay with the roller turned smoothly. I wiped out the plunger cylinder and plunger, re-lubricating it with new Mobil 1 5W-30.

Problems with 07

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Last edited by rob the elder; 04-17-2017 at 06:04 AM.
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post #9 of 24 (permalink) Old 04-17-2017, 06:21 AM Thread Starter
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Quote:
Originally Posted by rob the elder View Post
There have been reports of the HPFP leaking though he bottom seal into the oil. This is one, I have seen others.

Yikes! Dead HPFP

Removing the pump was pretty easy, but after doing so I observed raw gas and oil mix running out of the hole where the pump plunger goes into the head. It looks like whatever seals the gas in the pump from the mechanical plunger area failed, causing raw gas to spray into the cam area. Oh crap! (Censored because I actually said something else)

I pulled the dipstick to see if I smelled gas in the oil pan oil, or whether the oil level was higher than the full mark. Fortunately it looks like not too much gas ended up in the pan. Next I checked the pump roller plunger that rides on the cam pump lobe to see if there was damage or scoring. Other than being wet with a gas oil mix, it looked okay with the roller turned smoothly. I wiped out the plunger cylinder and plunger, re-lubricating it with new Mobil 1 5W-30.

Problems with 07
Did you use the alignment gauge to make sure that the camshaft lobe is in the base circle position? The tool is $75!!!! And it looks like it's just a giant, thick nail. Oh, and GM no longer has a GM part number for the fuel pump. It's an ACDelco number of HPM1005.

.

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Fujita CAI
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Windrestrictor V2 lighted in white
Windrestrictor lighted door sills lighted in white
DDM Works IC Piping
Undercar LEDs in white to match Windrestrictor

ZZPerformance dyno tuned - 286HP, 317ft/lbs of torque at 23psi of boost.

Last edited by The_Ghost; 04-17-2017 at 06:25 AM.
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post #10 of 24 (permalink) Old 04-17-2017, 01:31 PM Thread Starter
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Wouldn't my Fuel Pressure go do after I shut the car off if it was leaking?

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Windrestrictor V2 lighted in white
Windrestrictor lighted door sills lighted in white
DDM Works IC Piping
Undercar LEDs in white to match Windrestrictor

ZZPerformance dyno tuned - 286HP, 317ft/lbs of torque at 23psi of boost.
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post #11 of 24 (permalink) Old 04-17-2017, 03:28 PM
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Not if it is leaking on the low pressure side. Unless you are checking pressure on both sides of it.

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post #12 of 24 (permalink) Old 04-17-2017, 05:38 PM
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For my part, there is evidence that they can and have leaked both oil via the seal and gas onto the crank case. If I still had a HPFP I would change it

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post #13 of 24 (permalink) Old 04-17-2017, 06:28 PM
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I'll add my agreement. This is the lab I use: Blackstone Labs
Totally agree with using Blackstone. I use it on my cars, Attached is one of my reports.
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post #14 of 24 (permalink) Old 04-18-2017, 05:49 AM Thread Starter
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So I'm sitting here at work going through the GM Shop Manual. No wonder a dealer can't fix our cars correctly!! NOWHERE in their diag or repair for the p2188 code does it say to even look at the HPFP!!! It says to replace all injectors (about $1600), but nowhere in their service manual does it say to replace or even check the HPFP.

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Fujita CAI
ASAP T2 stripes and badging
Windrestrictor V2 lighted in white
Windrestrictor lighted door sills lighted in white
DDM Works IC Piping
Undercar LEDs in white to match Windrestrictor

ZZPerformance dyno tuned - 286HP, 317ft/lbs of torque at 23psi of boost.

Last edited by rob the elder; 04-18-2017 at 05:53 AM. Reason: typo
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post #15 of 24 (permalink) Old 04-18-2017, 05:54 AM
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Having lived with the GM shop manual for a decade, I too find it somewhat lacking in useful information.

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